Spindle Attachment Device for High-Speed Tapping
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Solution Overview
Problem
In general-purpose machining centers, increasing the rotation speed of the spindle to enhance processing efficiency leads to longer start-up times and reduced efficiency due to the need for frequent spindle direction reversals during tapping processes.
Innovation Solution
A spindle attachment device with a hollow casing, input and output shafts, a coupling member, and a gear train that increases the rotation speed of the spindle for transmission to a tapping tool, allowing high-speed tapping while maintaining low spindle rotation speed, thereby reducing start-up and reversal times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rotation speed of the spindle is increased to enhance processing efficiency, then the processing speed is improved, but the start-up time becomes longer
Solution Approach 1:
The patent divides the speed transmission function into two stages: the spindle rotates at low speed, and a speed increasing mechanism (gear train or belt drive) located in the tool holder multiplies the rotation speed before transmitting it to the tool. This segmentation allows the spindle to operate at low speed (short start-up time) while the tool receives high speed rotation (high processing efficiency).
Solution Approach 2:
The patent introduces an intermediary speed increasing mechanism (gear train or belt drive) between the spindle and the tool. This intermediary multiplies the rotation speed from the low-speed spindle to the high-speed tool requirement, resolving the contradiction between spindle start-up time and tool processing speed.
2Speed
If the rotation speed of the spindle is increased to improve processing efficiency, then the cutting speed is improved, but the reversal time becomes longer due to frequent direction switching
Solution Approach 1:
The patent segments the rotation speed control function: the spindle maintains low-speed bidirectional rotation (fast reversal), while the speed increasing mechanism provides unidirectional high-speed rotation to the tool. This eliminates the need for the spindle to reverse at high speed, reducing reversal time while maintaining cutting speed.
Solution Approach 2:
The speed increasing mechanism acts as an intermediary that converts the spindle's low-speed bidirectional rotation into high-speed unidirectional rotation for the tool. This intermediary allows the spindle to reverse quickly at low speed while the tool operates at high cutting speed, resolving the reversal time contradiction.
3Adaptability or versatility
If a tap holder is mounted on the spindle to enable tapping process, then the versatility of the machining center is improved, but the processing efficiency cannot reach the level of special-purpose tapping machines
Solution Approach 1:
The patent segments the functions between the spindle and the tool holder: the spindle provides low-speed rotation (fast acceleration and reversal), while the tool holder contains a speed increasing mechanism that multiplies the speed to achieve high-speed tapping. This segmentation enables the machining center to achieve tapping efficiency comparable to special-purpose machines while maintaining versatility.
Solution Approach 2:
The patent makes the tool holder a multi-functional component that not only holds the tap but also contains the speed increasing mechanism. This universal tool holder design enables both speed multiplication for high-efficiency tapping and compatibility with various tools, resolving the contradiction between versatility and processing efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-speed tapping with reduced spindle start-up and reversal times, improving processing efficiency comparable to special-purpose machines, while maintaining low spindle rotation speed.
Implementation Method 1
transmitting means disposed between the input shaft and the output shaft, the transmitting means increasing a rotation speed of the input shaft for a transmission to the output shaft
Data Source
AI summary
A spindle attachment device attached, for use, to a distal end of a spindle of a machine tool is provided. The spindle attachment device (11) includes a hollow casing (13) having an internal space; an input shaft (17) rotatably supported inside the casing; an output shaft (19) rotatably supported inside the casing; a coupling member (15) connected to the input shaft in order to join the input shaft to the spindle of the machine tool; a gear train (21) disposed between the input shaft and the output shaft in order to increase a rotation speed of the input shaft for a transmission to the output shaft; and a tap holder (25, 27) for mounting a tapping tool on the output shaft. The spindle attachment device increases the rotation speed of the spindle and transfers it to the tapping tool, and thus makes it possible to perform a tapping process on a workpiece at high speed, while maintaining the rotation speed of the spindle at a low level.